US11098736B2 - Cylinder housing, actuator, and cylinder housing manufacturing method - Google Patents

Cylinder housing, actuator, and cylinder housing manufacturing method Download PDF

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Publication number
US11098736B2
US11098736B2 US16/070,761 US201616070761A US11098736B2 US 11098736 B2 US11098736 B2 US 11098736B2 US 201616070761 A US201616070761 A US 201616070761A US 11098736 B2 US11098736 B2 US 11098736B2
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cylinder
thickness
cylinder portion
bent
cylinder housing
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US20210088057A1 (en
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Huy Hung HA
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Sanoh Industrial Co Ltd
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Sanoh Industrial Co Ltd
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Assigned to SANOH INDUSTRIAL CO., LTD. reassignment SANOH INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HA, HUY HUNG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
    • B60R21/38—Protecting non-occupants of a vehicle, e.g. pedestrians using means for lifting bonnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • B62D25/10—Bonnets or lids, e.g. for trucks, tractors, busses, work vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1438—Cylinder to end cap assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/19—Pyrotechnical actuators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
    • F15B2215/30—Constructional details thereof

Definitions

  • the present invention relates to a cylinder housing of an actuator for lifting a bonnet hood in the event of a collision, an actuator including the cylinder housing, and a cylinder housing manufacturing method.
  • the pop-up hood system includes a collision sensor which detects a collision with a pedestrian, an actuator which instantaneously lifts (pops up) a rear end portion of the bonnet hood, and an ECU which operates the actuator based on a detection result of the collision sensor.
  • the bonnet hood is also referred to as an engine hood, an engine lid, or the like. In the description below, the bonnet hood will be simply referred to as a hood.
  • the actuator includes a cylinder housing, a piston portion which is accommodated in the cylinder housing to be slidable, a rod portion which extends forward in the piston portion sliding direction from the piston portion and protrudes from the cylinder housing, and an explosive which is enclosed in the cylinder housing and moves the piston portion forward in the piston portion sliding direction. Then, the ECU explodes the explosive of the actuator when the collision sensor detects a collision with a pedestrian. Then, in the actuator, the piston portion moves forward by the pressure of the gas generated by the explosion of the explosive. Then, when the rod portion extends from the cylinder housing, the rear end portion of the bonnet hood is instantaneously lifted. Accordingly, a space below the bonnet hood is widened so that an impact on a head of the pedestrian is reduced.
  • Patent Literature 1 Japanese Unexamined Patent Publication No. 2013-071544
  • Patent Literature 2 Japanese Unexamined Patent Publication No. 2009-262853
  • a piston locking portion to which the piston portion is locked needs to be formed at the front end portion of the cylinder housing so that the piston portion is not separated from the cylinder housing. Since the piston portion which moves at a high speed by the explosion of the explosive collides with the piston locking portion, a large shear stress is applied thereto.
  • a cap serving as the piston locking portion is provided separately from the cylinder housing.
  • the cap is attached to the cylinder housing by crimping.
  • the cap is attached to the cylinder housing by threading. Then, the cap is made thicker than the cylinder housing so that the cap has a strength as the piston locking portion.
  • the cap serving as the piston locking portion is formed as a member separated from the cylinder housing. For this reason, a problem arises in that the number of components increases. Further, since the number of assembly steps for assembling the cap to the cylinder housing increases and the coaxiality of the cap with respect to the cylinder housing needs to be managed, a problem also arises in that a manufacturing cost increases.
  • an aspect of the invention is to provide a cylinder housing capable of securing a necessary strength while decreasing a manufacturing cost, an actuator, and a cylinder housing manufacturing method.
  • a cylinder housing is a cylinder housing of an actuator for lifting a bonnet hood in the event of a collision
  • the actuator includes the cylinder housing which is fixed to a vehicle body of a vehicle and extends in a center axis line direction, a piston portion which is accommodated in the cylinder housing to be slidable, a rod portion which extends forward in a sliding direction of the piston portion from the piston portion and protrudes from the cylinder housing, and a drive source which moves the piston portion forward in the sliding direction
  • the cylinder housing includes a cylindrical cylinder portion which extends in the center axis line direction, and a bent portion which is bent with respect to the cylinder portion and extends inward in a radial direction from an end portion of the cylinder portion
  • the cylinder portion includes a first cylinder portion, and a second cylinder portion which is located on the side of the bent portion in the first cylinder portion and is connected to the bent portion, wherein a thickness of the second cylinder portion
  • the cylinder housing according to an aspect of the invention includes the cylindrical cylinder portion and the bent portion which extends inward in the radial direction from the end portion of the cylinder portion. For this reason, when the drive source moves the piston portion, the piston portion moves while being guided to the cylinder portion and stops while colliding with the bent portion. That is, the bent portion serves as a piston locking portion which prevents the piston portion from being separated from the cylinder housing. Then, the bent portion is formed to be bent with respect to the cylindrical cylinder portion. That is, the bent portion is formed as a single member along with the cylinder portion. For this reason, it is possible to decrease the number of components of the actuator compared to the conventional cylinder housing in which a cap is formed as a separate member.
  • the thickness of the bent portion is larger than the thickness of the first cylinder portion, it is possible to improve the strength of the bent portion with respect to the first cylinder portion. For this reason, it is possible to efficiently secure a necessary strength while suppressing an increase in weight compared to a case where the thickness of the entire cylinder housing is increased. Further, since the thickness of the second cylinder portion is equal to or larger than the thickness of the first cylinder portion, the strength of the cylinder portion in the second cylinder portion does not decrease locally.
  • the thickness of the second cylinder portion may be larger than the thickness of the first cylinder portion.
  • a large stress is generated also in the vicinity of the bent portion.
  • the thickness of the second cylinder portion connected to the bent portion is set to be larger than the thickness of the first cylinder portion, it is possible to efficiently and effectively suppress the deformation of the bent portion while suppressing an increase in weight compared to a case where the thickness of the entire cylinder portion is increased.
  • the length of the second cylinder portion in the center axis line direction may be equal to or larger than the outer diameter of the second cylinder portion. It is considered that a stress generated by the collision with the bent portion in the piston portion increases to a position in which the length is substantially the same as the outer diameter of the cylinder portion from the bent portion.
  • the length of the second cylinder portion thicker than the first cylinder portion is equal to or larger than the outer diameter of the second cylinder portion, it is possible to further efficiently suppress the deformation of the bent portion.
  • An actuator is an actuator for lifting a bonnet hood in the event of a collision, including: any one of the above-described cylinder housings fixed to the vehicle body of the vehicle and extending in the center axis line direction; a piston portion which is accommodated in the cylinder housing to be slidable; a rod portion which extends in the center axis line direction from the piston portion and protrudes from the cylinder housing; and a drive source which moves the piston portion forward in the sliding direction.
  • the actuator according to an aspect of the invention includes any one of the above-described cylinder housings, it is possible to secure a necessary strength while decreasing a manufacturing cost.
  • a cylinder housing manufacturing method is a cylinder housing manufacturing method of an actuator for lifting a bonnet hood in the event of a collision, including: a thick portion forming step of forming a thick portion having a thickness thicker than the other portion at one end portion of a cylindrical tube extending linearly; and a bending step of bending at least a part of the thick portion inward in a radial direction.
  • the thick portion is formed in the tube in the thick portion forming step and then at least a part of the thick portion is bent inward in the radial direction in the bending step. Accordingly, it is possible to manufacture the cylinder housing including the cylindrical cylinder portion extending in the center axis line direction of the cylinder housing and the bent portion bent with respect to the cylinder portion and extending inward in the radial direction from the end portion of the cylinder portion.
  • a metal core may be disposed at the radial center portion of the tube and at least a part of the thick portion may be bent inward in the radial direction so that the front end of the thick portion is pressed against the metal core.
  • the thick portion cannot advance inward in the radial direction of the tube in relation to the metal core and is bent inward in the radial direction while being increased in thickness. Accordingly, since the thickness of the bent portion further increases, it is possible to further improve the strength of the bent portion.
  • a hole forming step of perforating the radial center portion of the bent portion bent by the bending step may be further provided.
  • the radial center portion of the bent portion is perforated by the hole forming step, it is possible to improve the shape accuracy of the through-hole through which the rod portion is inserted.
  • FIG. 1 is a diagram showing a state where an actuator is attached to a vehicle.
  • FIG. 2 is a perspective view showing the actuator.
  • FIG. 3 is a cross-sectional view showing the actuator.
  • FIG. 4 is a cross-sectional view showing a state after the actuator is operated.
  • FIG. 5 is a cross-sectional view showing a part of a cylinder housing.
  • FIG. 6 is a flowchart showing a cylinder housing manufacturing method.
  • FIG. 7 is a diagram illustrating the cylinder housing manufacturing method.
  • FIG. 8 is a cross-sectional view showing a modified example of the cylinder housing.
  • FIG. 1 is a diagram showing a state where an actuator is attached to a vehicle.
  • a pop-up hood system 1 is a system that lifts a hood 3 (a bonnet hood) of a vehicle 2 in the event of a collision with a protection target such as a pedestrian.
  • the pop-up hood system 1 includes a collision sensor 4 which detects a collision with a protection target, an actuator 5 which instantaneously lifts a rear end portion of the hood 3 , and an ECU 6 which operates the actuator 5 based on a detection result of the collision sensor 4 .
  • the collision sensor 4 for example, an acceleration sensor attached to a front bumper of the vehicle 2 can be used.
  • FIG. 2 is a perspective view showing the actuator.
  • FIG. 3 is a cross-sectional view showing the actuator.
  • FIG. 4 is a cross-sectional view showing a state after the actuator is operated.
  • the actuator 5 includes a fixed plate 11 which is fixed to a vehicle body of the vehicle 2 , a cylinder housing 12 which is fixed to the vehicle body of the vehicle 2 through the fixed plate 11 and extends in the direction of a center axis line Z, a piston portion 13 which is accommodated in the cylinder housing 12 to be slidable, a rod portion 14 which extends forward (upward in FIGS.
  • the actuator 5 will be described as the explosive-type actuator 5 for moving the piston portion 13 by the explosion of the explosive.
  • the drive source 16 is a pyrotechnic and ignition device that moves the piston portion 13 by explosion.
  • the sliding direction of the piston portion 13 is the same as the direction of the center axis line Z of the cylinder housing 12 .
  • the fixed plate 11 is a support member that is fixed to the cylinder housing 12 and fixes the cylinder housing 12 to the vehicle body of the vehicle 2 so that the rod portion 14 is directed toward the hood 3 .
  • the cylinder housing 12 includes a cylindrical cylinder portion 21 which extends in the direction of the center axis line Z, a bent portion 22 which is bent with respect to the cylinder portion 21 and extends inward in the radial direction from one end portion of the cylinder portion 21 , and an enlarged tube portion 23 which is enlarged in diameter at the other end portion of the cylinder portion 21 and encloses the drive source 16 . That is, the cylinder portion 21 , the bent portion 22 , and the enlarged tube portion 23 are integrated as a single member.
  • the bent portion 22 is a portion which is formed by bending one end portion of the cylinder portion 21 and the enlarged tube portion 23 is a portion which is formed by enlarging the tube (enlarging the diameter) at the other end portion of the cylinder portion 21 .
  • an enclosing member 17 for enclosing the drive source 16 is fitted to the enlarged tube portion 23 .
  • the bent portion 22 serves as a piston locking portion which prevents the piston portion 13 from being separated from the cylinder housing 12 .
  • a through-hole 24 through which the rod portion 14 is inserted is formed at the radial center portion of the bent portion 22 . Then, the piston portion 13 is inserted into the cylinder portion 21 and the rod portion 14 extending from the piston portion 13 protrudes from the cylinder housing 12 through the through-hole 24 . Additionally, the front end portion of the rod portion 14 protruding from the cylinder housing 12 is enlarged in diameter to reduce an impact on the hood 3 .
  • the ECU 6 is a control unit for controlling the operation of the actuator 5 .
  • the ECU 6 operates the actuator 5 by igniting the explosive of the drive source 16 with an ignition device to explode.
  • the piston portion 13 is disposed at the end portion on the side of the enlarged tube portion 23 of the cylinder portion 21 and the front end portion of the rod portion 14 extending from the piston portion 13 protrudes from the cylinder housing 12 . Then, when the collision sensor 4 detects a collision with the protection target, the ECU 6 explodes the explosive of the drive source 16 . Then, the piston portion 13 is guided to the cylinder portion 21 by the pressure of the gas generated by the explosion of the explosive so that the piston portion advances toward the bent portion 22 at a high speed.
  • the rod portion 14 extends from the cylinder housing 12 toward the hood 3 at a high speed so that the rear end portion of the hood 3 is lifted instantaneously. Then, the piston portion 13 collides with the bent portion 22 so that the movement of the piston portion 13 and the rod portion 14 is stopped.
  • the thickness of the cylinder housing 12 is set as below so that the deformation of the bent portion 22 with respect to the shear stress does not increase too much.
  • FIG. 5 is a cross-sectional view showing a part of the cylinder housing.
  • the cylinder portion 21 includes a first cylinder portion 25 which is connected to the enlarged tube portion 23 and a second cylinder portion 26 which is located on the side of the bent portion 22 of the first cylinder portion 25 and is connected to the bent portion 22 .
  • the first cylinder portion 25 has the same thickness A in the entire region in the direction of the center axis line Z. Further, the second cylinder portion 26 has the same thickness B in the entire region in the direction of the center axis line Z.
  • the meaning that the thickness is the same includes not only a case where the thickness is completely the same but also a case where the thickness is within an allowable range due to tolerance.
  • the thickness B of the second cylinder portion 26 is larger than the thickness A of the first cylinder portion 25 .
  • the thickness B of the second cylinder portion 26 is set to be larger than the thickness A of the first cylinder portion 25 so that the deformation of the bent portion 22 does not become excessive due to the deformation of the cylinder portion 21 .
  • the inner diameter of the second cylinder portion 26 is the same as the inner diameter of the first cylinder portion 25 and the outer diameter of the second cylinder portion 26 is larger than the outer diameter of the first cylinder portion 25 . That is, the cylinder portion 21 has the same inner diameter in the entire region in the direction of the center axis line Z in order to guide the movement of the piston portion 13 on the inner peripheral surface.
  • the meaning that the inner diameter is the same includes not only a case where the thickness is completely the same but also a case where the thickness is within an allowable range due to tolerance.
  • the inner diameter of the cylinder portion 21 is set to a dimension so that the piston portion 13 is movable with respect to the cylinder portion 21 and air tightness between the cylinder portion 21 and the piston portion 13 is maintained to some extent.
  • a length D of the second cylinder portion 26 in the direction of the center axis line Z is equal to or larger than an outer diameter E of the second cylinder portion 26 . It is considered that a stress generated by the collision with the bent portion 22 in the piston portion 13 increases to a position in which the length is substantially the same as the outer diameter of the cylinder portion 21 from the bent portion 22 .
  • the length D of the second cylinder portion 26 in the direction of the center axis line Z is set to be equal to or larger than the outer diameter E of the second cylinder portion 26 in order to efficiently suppress the deformation of the bent portion 22 .
  • a thickness C of the bent portion 22 is larger than the thickness A of the first cylinder portion 25 .
  • the thickness C of the bent portion 22 is set to be larger than the thickness A of the first cylinder portion 25 so that the deformation of the bent portion 22 does not become excessive due to the shear stress.
  • the thickness C of the bent portion 22 can be set to the maximum thickness of the bent portion 22 or the thickness at a position adjacent to the cylinder portion 21 .
  • a ratio of the thickness C of the bent portion 22 with respect to the thickness A of the first cylinder portion 25 is not particularly limited.
  • the thickness C of the bent portion 22 can be set to be 1.2 times or more and further 1.5 times or more the thickness A of the first cylinder portion 25 . Further, the thickness C of the bent portion 22 can be set to be 2 times or less and further 1.6 times or less the thickness A of the first cylinder portion 25 .
  • the thickness C of the bent portion 22 is equal to or larger than the thickness B of the second cylinder portion 26 .
  • the reason why the piston portion 13 is separated from the cylinder housing 12 is that the influence of deformation of the bent portion 22 is larger than that of the second cylinder portion 26 .
  • the thickness C of the bent portion 22 is set to be equal to or larger than the thickness B of the second cylinder portion 26 in order to efficiently prevent the piston portion 13 from being separated from the cylinder housing 12 .
  • FIG. 6 is a flowchart showing a cylinder housing manufacturing method.
  • FIG. 7 is a diagram illustrating the cylinder housing manufacturing method. As shown in FIGS. 6 and 7 , a cylindrical tube 31 which extends linearly is first prepared (see FIG. 7( a ) ). The tube 31 has the same thickness in the entire length.
  • a thick portion forming step (S 1 ) is performed.
  • a thick portion 32 is formed at one end portion of the tube 31 to be thicker than the other portion.
  • the tube 31 is provided with a thin portion 33 having a thin thickness and the thick portion 32 having a thickness thicker than that of the thin portion 33 (see FIG. 7( b ) ).
  • the thick portion 32 has the same thickness in the entire length and the thin portion 33 has the same thickness in the entire length.
  • a boundary between the thick portion 32 and the thin portion 33 may be Ruined as a step, but in order to reduce the concentration of the stress, the boundary may be desirably formed in a tapered shape, that is, a shape in which the thickness gradually decreases from the thick portion 32 to the thin portion 33 .
  • the thin portion 33 includes the enlarged tube portion 23 and the first cylinder portion 25 of the cylinder housing 12 and the thick portion 32 includes the bent portion 22 and the second cylinder portion 26 of the cylinder housing 12 .
  • a bending step (S 2 ) is performed.
  • the thick portion 32 is bent inward in the radial direction (see FIG. 7( c ) ).
  • a part of the thick portion 32 is bent inward in the radial direction.
  • the thick portion 32 may be bent at one time, but may be gradually bent a plurality of times. It is desirable that the bent angle is a right angle with respect to the center axis line direction of the tube 31 , but the bent angle may not be a right angle with respect to the center axis line direction of the tube 31 if a deformation caused by the collision of the piston portion 13 does not become excessive.
  • bent portion 34 which is formed to be bent by the bending step in the thick portion 32 becomes the bent portion 22 of the cylinder housing 12 and a portion which is not formed to be bent by the bending step in the thick portion 32 becomes the second cylinder portion 26 of the cylinder housing 12 .
  • a metal core 35 is disposed at the radial center portion of the tube 31 . Then, at least a part of the thick portion 32 is bent inward in the radial direction so that the front end of the thick portion 32 is pressed against the metal core 35 . Then, since the thick portion 32 cannot advance inward in the radial direction of the tube 31 in relation to the metal core 35 , the thick portion 32 is bent inward in the radial direction while being increased in thickness. Then, the metal core 35 is removed from the tube 31 after the bending step ends. Additionally, the hole of the thick portion 32 which is formed by the removal of the metal core 35 becomes the through-hole 24 of the cylinder housing 12 .
  • a hole forming step (S 3 ) is performed.
  • the radial center portion of the bent portion 34 formed to be bent by the bending step (S 2 ) is perforated (see FIG. 7( d ) ). Accordingly, the shape accuracy of the through-hole 24 can be improved.
  • a tube enlargement step (S 4 ) is performed.
  • the tube (the diameter) of the front end portion of the thin portion 33 is enlarged (see FIG. 7( e ) ).
  • an enlarged tube portion 36 in which the tube is enlarged by the tube enlargement step becomes the enlarged tube portion 23 of the cylinder housing 12 .
  • the cylindrical cylinder portion 21 and the bent portion 22 extending inward in the radial direction from the end portion of the cylinder portion 21 are provided. For this reason, when the drive source 16 moves the piston portion 13 , the piston portion 13 moves while being guided to the cylinder portion 21 and then stops while colliding with the bent portion 22 . That is, the bent portion 22 serves as a piston locking portion which prevents the piston portion 13 from being separated from the cylinder housing 12 . Then, the bent portion 22 is formed to be bent with respect to the cylindrical cylinder portion 21 . That is, the bent portion 22 is formed as a single member along with the cylinder portion 21 .
  • the thickness B of the second cylinder portion 26 connected to the bent portion 22 is set to be larger than the thickness A of the first cylinder portion 25 , it is possible to efficiently and effectively suppress the deformation of the bent portion 22 while suppressing an increase in weight compared to a case where the thickness of the entire cylinder portion 21 is large.
  • the length D of the second cylinder portion 26 thicker than the first cylinder portion 25 is equal to or larger than the outer diameter E of the second cylinder portion 26 , the deformation of the bent portion 22 can be further efficiently suppressed.
  • the thick portion 32 is formed in the tube 31 by the thick portion forming step (S 1 ) and then at least a part of the thick portion 32 is bent inward in the radial direction by the bending step (S 2 ). Accordingly, it is possible to manufacture the cylinder housing 12 including the cylindrical cylinder portion 21 which extends in the direction of the center axis line Z of the cylinder housing 12 and the bent portion 22 which is bent with respect to the cylinder portion 21 and extends inward in the radial direction from the end portion of the cylinder portion 21 .
  • the thick portion 32 cannot advance inward in the radial direction of the tube 31 in relation to the metal core 35 and is bent inward in the radial direction while being increased in thickness. Accordingly, since the thickness of the bent portion 22 is further increased, the strength of the bent portion 22 can be further improved.
  • the radial center portion of the bent portion 22 is perforated by the hole forming step (S 3 ), it is possible to improve the shape accuracy of the through-hole 24 through which the rod portion 14 is inserted.
  • the thickness of the first cylinder portion 25 may be the same as that of a second cylinder portion 26 A.
  • the second cylinder portion 26 A is the same as the first cylinder portion 25 .
  • the explosive-type actuator for moving the piston portion by the explosion of the explosive has been described.
  • the configuration of the drive unit is not particularly limited and various configurations can be employed.
  • a method including the hole forming step has been described as a method of manufacturing the cylinder housing 12 .
  • the hole forming step may not be provided.
  • the metal core 35 may not be disposed at the radial center portion of the tube 31 in the bending step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Actuator (AREA)
  • Superstructure Of Vehicle (AREA)
US16/070,761 2016-01-19 2016-10-31 Cylinder housing, actuator, and cylinder housing manufacturing method Active 2038-05-05 US11098736B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JPJP2016-007756 2016-01-19
JP2016-007756 2016-01-19
JP2016007756A JP6637771B2 (ja) 2016-01-19 2016-01-19 シリンダハウジング、アクチュエータ及びシリンダハウジングの製造方法
PCT/JP2016/082308 WO2017126183A1 (ja) 2016-01-19 2016-10-31 シリンダハウジング、アクチュエータ及びシリンダハウジングの製造方法

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US11098736B2 true US11098736B2 (en) 2021-08-24

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US (1) US11098736B2 (ja)
EP (1) EP3406493B1 (ja)
JP (1) JP6637771B2 (ja)
CN (1) CN108473107B (ja)
ES (1) ES2869552T3 (ja)
WO (1) WO2017126183A1 (ja)

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CN114178849B (zh) * 2021-12-31 2022-11-22 成都中科卓尔智能科技集团有限公司 一种底火压装生产系统

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JP2017128176A (ja) 2017-07-27
EP3406493B1 (en) 2021-03-17
US20210088057A1 (en) 2021-03-25
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CN108473107A (zh) 2018-08-31
JP6637771B2 (ja) 2020-01-29

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